Нет ни одного правильного предложения. Почти все предложения - III тип условных предложений
В главном предложении would have и смысловой глагол в III форме, а в придаточном had и III форма смыслового глагола
2. He will work harder in French lessons if he has a French penfriend.
3. If he had been ill on the day of the exam could he have taken it at another time?
4. If I had enjoyed studying, I would have gone to university.
5. If she had left home earlier, would she have got to the interview on time?
6. My parents would not have been angry if I had phoned and told them where i was.
7. If I had not slept late this morning, I wouldn't have missed breakfast.
8. Could she have got the job if she had not known the boss?
9. I would not have known anything about Picasso if we had not learned about him at school.
10. A lot of people wouldn't have been successful if they had been discouraged by their failures.